From: Steven Rostedt <rostedt@goodmis.org>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Paul Turner <pjt@google.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Galbraith <efault@gmx.de>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
Clark Williams <clark@redhat.com>,
Andrew Theurer <habanero@us.ibm.com>
Subject: Re: [RFC] sched: The removal of idle_balance()
Date: Fri, 15 Feb 2013 10:05:41 -0500 [thread overview]
Message-ID: <1360940741.23152.110.camel@gandalf.local.home> (raw)
In-Reply-To: <20130215074538.GA25845@lge.com>
On Fri, 2013-02-15 at 16:45 +0900, Joonsoo Kim wrote:
> Hello, Steven.
> - Before Patch
> Permance counter stats for 'perf bench sched messaging -g 300' (10 runs):
>
> 40847.488740 task-clock # 3.232 CPUs utilized ( +- 1.24% )
> 511,070 context-switches # 0.013 M/sec ( +- 7.28% )
> 117,882 cpu-migrations # 0.003 M/sec ( +- 5.14% )
> 1,360,501 page-faults # 0.033 M/sec ( +- 0.12% )
> 118,534,394,180 cycles # 2.902 GHz ( +- 1.23% ) [50.70%]
> <not supported> stalled-cycles-frontend
> <not supported> stalled-cycles-backend
> 46,217,340,271 instructions # 0.39 insns per cycle ( +- 0.56% ) [76.93%]
> 8,592,447,548 branches # 210.354 M/sec ( +- 0.75% ) [75.50%]
> 273,367,481 branch-misses # 3.18% of all branches ( +- 0.26% ) [75.49%]
>
> 12.639049245 seconds time elapsed ( +- 2.29% )
>
> - After Patch
> Performance counter stats for 'perf bench sched messaging -g 300' (10 runs):
>
> 42053.008632 task-clock # 2.932 CPUs utilized ( +- 0.91% )
> 672,759 context-switches # 0.016 M/sec ( +- 2.76% )
> 83,374 cpu-migrations # 0.002 M/sec ( +- 4.46% )
> 1,362,900 page-faults # 0.032 M/sec ( +- 0.20% )
> 121,457,601,848 cycles # 2.888 GHz ( +- 0.93% ) [50.75%]
> <not supported> stalled-cycles-frontend
> <not supported> stalled-cycles-backend
> 47,854,828,552 instructions # 0.39 insns per cycle ( +- 0.36% ) [77.09%]
> 8,981,553,714 branches # 213.577 M/sec ( +- 0.42% ) [75.41%]
> 274,229,438 branch-misses # 3.05% of all branches ( +- 0.20% ) [75.44%]
>
> 14.340330678 seconds time elapsed ( +- 1.79% )
>
Interesting that perf bench gives me a little better performance with
the idle_balance than without too. But hackbench still shows a huge
performance without idle_balance. The funny part about that is perf
bench sched messaging is based off of hackbench??
I would really like to know why hackbench gets a 50% performance without
idle balancing. Perhaps it is some kind of fluke :-/
-- Steve
next prev parent reply other threads:[~2013-02-15 15:05 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-15 6:13 [RFC] sched: The removal of idle_balance() Steven Rostedt
2013-02-15 7:26 ` Mike Galbraith
2013-02-15 12:07 ` Peter Zijlstra
2013-02-15 12:21 ` Peter Zijlstra
2013-02-15 12:32 ` Mike Galbraith
2013-02-16 16:12 ` Steven Rostedt
2013-02-17 6:26 ` Mike Galbraith
2013-02-17 7:14 ` Mike Galbraith
2013-02-17 21:54 ` Steven Rostedt
2013-02-18 3:42 ` Mike Galbraith
2013-02-18 15:23 ` Steven Rostedt
2013-02-18 17:22 ` Mike Galbraith
2013-02-15 7:45 ` Joonsoo Kim
2013-02-15 15:05 ` Steven Rostedt [this message]
2013-02-17 6:26 ` Mike Galbraith
2013-02-18 8:13 ` Srikar Dronamraju
2013-02-18 15:25 ` Steven Rostedt
2013-02-19 4:13 ` Rakib Mullick
2013-02-19 7:29 ` Michael Wang
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